Question # 1

The Kw. of water at 25 C° is given by

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10(-7)

10(-10)

10(-12)

10(-14)

The arrangement ABC, ABC .... is referred as

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cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

An amine is produced in the following reaction
C2H5l+2NH3-------C2H5NH2 +NH4l. What is mechanism?

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

In a cubic lattice a unit cell is shard equally by how many unit cells?

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4

2

6

8

Formalin is used as:

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Fungicide

Germicide

Sterilizing of surgical instruments

All three

Which gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

Cholesterol is a precursor of steroid hormones, Choose the class of steroid:

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a carbohydrate

a hydrocarbon

a natural lipid

a protein a hydrocarbon

Which one of the following will react with bothethand and ethanoic acid at room temperature

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CaCO3

CuO

Na-metal

CH3OH

Which is not an enzyme

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Transverses

Lipase

Lyase

None of these

Molten lead and iead (II) bromide both conduct electricity. Which one of the following statements relating to this is true?

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Both undergo chemical change when they conduct

Both conduct by the movement of charge particles

Both will also conduct in the solid state

Both contain mobile electrons

Alpha helix and beta pleated sheath are secondary structures of protein which are maintained by

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dipole forces

non-polar interactions

ionic bonds

Hydrogen bonds

The final product formed by distilling ethyl alcohol with excess of Cl₂and Ca(OH)₂is

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CH₃CHO

CCl₃CHO

CHCl₃

(CH₃)₂O

An organic acdi having molecular formula C₂H₄O₂is

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Formic acid

Acetic acid

Oxalic acid

Propionic acid

Atomic number of Al is 13. When it forms ionic bond with oxygen the number of electrons lost by 1 Al atom is

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1

2

3

4

A salt producing hydrocarbon among these compounds is

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Ehyne

Ethene

Methane

Ethane

Major food factors are:

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Fats and oils

Carbohydrates

Protiens

All of these

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Excitantion of an electron from 2s to 2p-orbital

Transfer of three electrons from B to the other atoms

Excitation of two electrons form 2s orbital to 2p orbital

Formation of molecular ion

Which is a reagent for Lucas test

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ZnCl₂+ Conc. HCl

Zn

Na

Br

A single chloride free radical can destroy bow many ozone molecules?

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100

100000

10000

10

A large value of K_cmeans that at equilibrium :

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Less reactant and more products.

Reactants and product in same amounts.

More reactants and less products.

None of above.

Which of the following is not a sub-atomic particle

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Electron

Proton

Neutron

Deuteron

The reaction rate is expressed in the units of

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Mol dm^-3S^-

Mol dm^-3

Mol dm^-3N^-

dm^-3S^-

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